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Simplifying 72 + -1r + 20 = 70 Reorder the terms: 72 + 20 + -1r = 70 Combine like terms: 72 + 20 = 92 92 + -1r = 70 Solving 92 + -1r = 70 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-92' to each side of the equation. 92 + -92 + -1r = 70 + -92 Combine like terms: 92 + -92 = 0 0 + -1r = 70 + -92 -1r = 70 + -92 Combine like terms: 70 + -92 = -22 -1r = -22 Divide each side by '-1'. r = 22 Simplifying r = 22
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